Brake mechanism for paper-cutting machines and the like



March 31, 1953 w. c. RUPP 2,633,219 BRAKE MECHANISM FOR PAPER-CUTTINGMACHINES AND THE LIKE Filed Aug. 27, 1949 2 SPEETS--SHEET l INVENTOR.

M1. LIAM c. EUPP .2 owih lmvlwl March 31, 1953 w c RUPP 2,633,219 BRAKEMECHANISM FOR PAPER-CUTTING MACHINES AND THE LIKE Filed Aug. 27, 1949 2SHEETS-SHEET 2 INVENTOR. W/L LIA/1 c.1214

ATTQILNEYS' Patented Mar. 31, 1953 BRAKE MECHANISM FOR PAPER-CUTTINGMACHINES AND THE LIKE William C. Rupp, Parma, Ohio, assignor to TheChandler & Price Company, Cleveland, Ohio,

a corporation of Ohio Application August 27, 1949, Serial No. 112,659

1'7 Claims.

This invention relates as indicated to a novel brake mechanism and moreparticularly to such mechanism especially adapted for use in conjunctionwith power driven machines where it is desired that the operation of themachine be automatically stopped at the conclusion of a cycle. Theembodiment of such invention described in detail below is particularlyarranged and designed for use in a power driven paper cutting machine,but it will be understood that my new mechanism is also adapted for usein forging machines and the like where similar automatic control isdesired.

Power driven paper cutting machines have long been employed for thepurpose of cutting and trimming stacks of paper sheets and theirconstruction has become fairly well standardized. Generally, suchmachines comprise a bed or table upon which a stack of sheets may beprecisely positioned by means of adjustable gauges and a verticallyreciprocable knife which is drawn down and again elevated by means of apower driven crank. Since it is generally necessary for the operator tomanually position the stacks of sheets to some degree on the table, itis of considerable importance that the machine should not beaccidentally actuated during such preliminaries as otherwise veryserious accidents may result. It is also important that after completionof a cut the knife should return to fully elevated position and remainthere. Otherwise, the operator may be endangered and also, if the knifehas started again to descend, there may not be sufficient clearance forremoval of the stack of sheets and insertion of a new stack.

It is therefore a primary object of my invention to provide means whichwill positively prevent the contingency of the machine from overrunningand making more than one cut.

Another object is to provide operating control means which must be movedin two different directions in sequence to operate the drive mechanismsothat the knife cannot be accidentally actuated.

Other objects of my invention will appear as the description proceeds.

To the accomplishment of the foregoing and related ends, said inventionthen comprises the features hereinafter fully described and particularlypointed out in the claims, the following description and the annexeddrawing setting forth in detail certain illustrative embodiments of theinvention, these being indicative, however, of but a few of the variousways in which the principle of the invention may be employed.

In said annexed drawing:

Fig. 1 is a front elevational view of a paper cutting machineembodyingmy invention;

Fig. 2 is a detail drawing of the drive unit assembly including my novelcycle control mechanism;

Fig. 3 is a detail view similar to Fig. 2 but showing the position ofthe parts of such mechanism when the control lever has beenpreliminarily moved in one direction;

Fig. 4 is another view similar to Figs. 2 and 3 showing the position ofsuch parts after such lever has next been moved in the oppositedirection to initiate reciprocation of the knife;

Fig. 5 is a vertical sectional view taken along the line 55 on Fig. 4;and

Fig. 6 is an end elevational view of the drive unit shown in Fig. 2.

General construction Referring now more particularly to said drawing,the new brake mechanism of my invention may be incorporated in a papercutting machine of generally conventional construction comprising a baseframe I carrying a bed or table 2 on which a stack of sheets may bepositioned to be cut. A back gauge 3 may be adjusted rearwardly orforwardly of table 2 by means of hand-wheel 4, the position of suchgauge being indicated by a traveling steel tape in window 5 as describedin Reichart Patent No. 2,203,547. A knife bar 6 carrying knife 1 ismounted for generally vertical reciprocation in upper frame 8 and abinder clamp 9, the lower portion of which protrudes below knife 1 inFig. l, is adapted to be raised and lowered by means of an electricmotor [0 to clamp the stack of sheets tightly until the out has beencompleted and the knife withdrawn. A preferred form of binder clamp isillustrated and described in my co-pending application Serial No.60,341, filed November 16, 1948. Back gauge 3 after being adjusted bymeans of hand-wheel 4 may be locked in adjusted position by locking leveII.

The knife bar 6 is suspended in uppen frame 8 by means of links I2 andI3 so that when the knife is brought down it will make a sliding outfrom right 'to left as viewed in Fig. 1. An angularly upward extension[4 of link I3 is pivotally connected to crank l5 by means of connectingrod is. Crank I5 is keyed to crankshaft I! and driven thereby toreciprocate knife bar 6 and knife 1 as described below.

The drive unit installed in or removed from the base I of the machine tofacilitate adjustment or repair. The main drive shaft 59 is journalledin bearing at one end of frame member I3 and carries a flywheel 2| anddrive pulley 22 freely rotatably mounted thereon. Such flywheel isjoined to such pulley for rotation therewith when .the latter is drivenby a conventional electric motor and belting (not shown). A worm gear 23is keyed to shaft I3 to drive Worm wheel 24 keyed to crankshaft Ilwithin gear case 25.

A disc clutch 25 of well-known construction is provided releasably toengage flywheel 2| in driving relationship with drive shaft I9, suchaction being effected by shifting of cone 2'! to the right as viewed inFig. 2 to spread clutch actuating fingers 28.

The disc type brake 29 is operative tostop rotation of shaft I9 whenactuated by shifting of cone 30 to the left as viewed in Fig. 2 tospread brake actuating fingers 3 5.

"Referring now. more particularly to Fig. 5 of the drawing, it will beunderstood thatthe two cones 27 and 39 are joined by a sleeve 32 oflesser diameter forming a peripheral groove 33 in which are engaged theshifting shoes 34 and 35 of yoke '36. Such yoke is keyed to clutchoperating shaft '31 so that when such latter shaft is rocked'to rockyoke '36 to the left as viewed in Fig. 2 the flywheel 2| will bedisengaged and brake 29 engaged, and when rocked to the right as shownin Fig. 4 the flywheel "will be engaged in driving connection with shaftI9 and brake 29 will be disengaged. A hand operating lever 38 is keyedto shaft 3'! thus to rock the same.

The cycle control mechanism A collar 39 is freely rotatably 'mounted oncrankshaft I1 and provided with an abutment 40 for a purpose explainedbelow. A brake operating lever 4i keyed to shaft 3? is pivotallyeccentrically connected to collar 39 at "42 by means of a longitudinallyadjustable link 43. A lost motion connection between such link and lever4| is provided bymeans of a slot '44 in the end of such link in whichstud 45 on the end of lever 4| is slidably engaged.

A dog 46 is keyed to crankshaft I'I for'rotation therewith and isadapted to engage abutment 48 on collar 39 to carrysuch latter collarwith it as such shaft rotates.

Operation .Aftera stackof sheets has been properlypositioned .on table 2against back gauge 3, the oper .ator first moves clutch lever 38 to theright as viewed in Fig. l or to the left as viewed in.Fig. 2. Such.movement of the lever causes the latter .to operate microswitch 47completing a circuit initiating downward movement of binder clamp .9. Itwill be seen, therefore, that such clamp starts its downward movementbefore the knife is actuated, insuring that the stack of sheets will befirmly clamped-before the-knife descends. While brake .29 is already on,it will be apparent as shown in Fig. 2 that cone 3d may still be shiftedslightly more tothe left with very little additional spreading 'of brakeactuating fingers 3I. Such rocking .of shaft 3'6, moreover, rocks lever4| sufficiently in a counterclockwise direction as shown inFig. 3 topermit link 43 suflicient play so that eccentric connection 42 of :suchlink with collar 39 may drop past the center line of crankshaft It istherefore now possible to rock lever ti in a'clockwise direction whichthe opera- .tornext accomplishes by shifting control lever38 .to driveshaft I9.

from right to left as viewed in Fig. 1 or from left to right as viewedin Figs. 2, 3 and 4. Clutch operating shaft 3! consequently rocks yoke36 from left to right as viewed in such latter figures, disengagingbrake 29 and engaging flywheel 2| Rotation of shaft 19 turns worm 23 andworm wheel 24 to rotate crankshaft I! and crank I5 to reciprocateconnecting rod I6 and therefore knife 1. Dog 46 picks up abutment 40 asit turns with shaft I1 and carries collar 39 with'i't (Fig-4)..

When crankshaft I1 has revolved sufficiently (one complete revolution)to return crank I5 to Fig. 2 position (thereby likewise again elevatingvtheknife toits uppermost position), dog 46 bearing against abutment 49will have rotated collar 39 to draw link 43 into engagement with stud 45on brake operating lever 4|. Such latter lever will as a result havebeen rocked in a counterclockwise direction into Fig. 2 position,thereby likewise rocking ,yoke 36 to disengage flywheel 2| and applybrake 29. The length of link 43 is, of course, adjusted to insure thatlever M will "have been rocked suflicientlypositively to apply brake 29to stop rotation of shaft I9 before the center line ofeccentric-connection 42 of such link passes the center line ofcrankshaft l7. In other words, any final tendency of crankshaft I! tocontinue rotation once the mechanism has reached the Fig. 2 positionmerely serves, through engagement of dog 4'6'with abutment 43, to drawlink 43 tighter and apply brake 29 more firmly. There is, therefore, nopossibility of knife 1 repeating the cut or even passing the uppermostpoint in its reciprocation.

.A'cam-48 turning with shaft I 1 is adapted to operate a 'microswitch 50after return of the knife :to cause binder clamp 9 to be elevated, allasm'ore fully disclosed in my 'cop'ending application Serial No. 60,341.Since clutch operating lever 3811s keyed to shaft 31, itwillof coursealso have been returned to starting position. As above described, thenext cycle of operation cannot, .however, be initiated until such leverhas been manually rocked sufiiciently to permit eccentric connection'of'link -43 to collar39 to drop under thein'fiuenceof gravity, causingthe center line of such .linkto :drop below the center line ofcrankshaft I].

Dog 36 .is,;of course, keyed to shaft il in proper position relative tocrank I5 so that such dog willcause link .43 to'be pulled to apply thebrake whenthe crankhasreturned the knife to uppermost -.or restposition. The entire mechanism is relatively simple and inexpensive ofconstruclllOll but positive and reliable 'in operation. It IS also veryeasy to adjust. Link 43 and collar 39 in effect constitute .a :togglearrangement looking the machine against further operation untilintentionally released by the operator. It is im possible to move clutchoperating lever to disengage the brake and engage the flywheel until the-opera'tor has first rocked such lever in the opposite direction topermit eccentric collar 39 to turn enough to drop the-center line ofeccentric connection 42 of link 43 below the center line of crankshaft I5.

The gearing '23, 24, may be of the irreversible type although this isnot necessary. When the machine has been stopped by brake 29 there isinsufficient leverage applicable on the eccentric to permit the operatorto shift lever 33 to disengage the brake without first rocking the sameto bring the point of pivotal connection of link 43 andsuch eccentricpast dead center, since this would otherwise require reverse rotation ofcrankshaft l1.

While, in the specific mechanism described by Way of illustration of myinvention, I have shown the elements so arranged and adjusted thateccentric 39 will turn past dead center under the influence of gravitywhen lever d! is manually rocked theretoward, it is of course obvious"that 'a. spring may be provided to supplement or replace reliance ongravity for this purpose.

Clutch operating rocker shaft 31 has three levers keyed thereto, namelyhand operating lever 38, shifting yoke 35, and lever 4|.

but the functions of such various levers could be combined, if desired.The provision of a turnbuckle or like means for adjusting the featuresstatedin any of the following claims or the equivalent of such beemployed.

I thereforeparticularly point out and distinctly claim as my invention:

1. In drive means for paper cutting machines and the like wherein it isdesired to turn a crank through one cycle only until another cycle isinitiated by theo-perator; a crank, a crankshaft to-which said crank iskeyed, a drive shaft, worm gear means connecting said crankshaft anddrive shaft for driving the former by the latter, a disc type clutch onsaid drive shaft, a disc type brake on said drive shaft, a flywheelrotatably mounted on said drive shaft, a double cone mounted forreciprocation longitudinally of said drive shaft and adapted whenshifted in one direction to apply said brake and when shifted in theother direction to engage said clutch for driving said drive shaft bysaid flywheel, means for driving said flywheel, a yoke engaging saiddouble cone and mounted for rocking action to reciprocate said cone, ahand operating lever operative thus to rock said yoke to shift saidcone, a rocker arm operative, when rocked, to rock said yoke therewith,an eccentric freely rotatably mounted on said crankshaft, alongitudinally adjustable link pivotally connecting said eccentric andsaid rocker arm, such connection with said rocker arm includingprovision for lost motion, said link thereby engaging said rocker arm torock said arm to shift said cone to apply said brake but beingineffective to rock said arm to shift said cone to engage said clutchwhen said eccentric is rotated, an abutment on said eccentric, and a dogkeyed to said crankshaft adapted to engage said abutment to rotate saideccentric therewith, the length of said link being adjusted to rock saidarm to apply said brake and disengage said flywheel when such eccentricconnection of said link has thus been carried around such crankshaft toa point nearly but not quite diametrically opposite the pivotalconnection of said link and arm, further operation being therebyprevented until said hand operating lever is manually rocked to applysaid brake still more firmly and incidentally thereto rocking saidrocker arm sufficiently toward said crankshaft to permit such eccentricconnection to drop by gravity past such diametrically opposite point,whereupon the operating cycle may now be initiated by moving This hasbeen found to be a convenient arrangement 6 said hand operating lever todisengage said brake and re-engage said clutch.

2. In drive means for power driven paper cutting machines and the likehaving a crank adapted to be turned to operate such machine; acrankshaft to which such crank is secured for rotation therewith, adrive shaft disposed at right angles to said crankshaft, worm gear meansconnecting said crankshaft and drive shaft for driving the former by thelatter, a disc type brake on said drive shaft, a flywheel mounted forrotation on said drive shaft spaced from said brake, a disc type clutchadapted to engage said flywheel for rotation with said drive shaft,shifter means interposed between said brake and clutch adapted whenmoved in the direction of said crankshaft longitudinally of said driveshaft to engage said brake and disengage said clutch and when moved inthe opposite direction to release said brake and engage said flywheel indriving engagement with said drive shaft, a rock shaft disposed at rightangles to said drive shaft, a rocker arm secured to said rock shaftoperative thus to move said shifter means, a hand operating leversecured to said rock shaft to rock the latter, a second lever secured tosaid rock shaft likewise operative to rock the same, an eccentric freelyrotatably mounted on said crankshaft, a link pivotally connecting saideccentric and said second lever, said link including provision for lostmotion permitting rocking of said second lever toward said crankshaftwithout opposition of saidlink, and a dog on said crankshaft adapted toengage said eccentric for rotation therewith, said link being effective,when the pivotal connection of said link and eccentric has been thuscarried around said crankshaft to a point nearly but not quitediametrically opposite the pivotal connection of said link and secondlever, automatically to rock said second lever to rock said rocker armto apply said brake and disengage said flywheel, further operation beingthereby prevented until said hand operating lever is manually rocked toapply said brake still more firmly and incidentally thereto to rock saidsecond lever sufiiciently toward said crankshaft to permit such pivotalconnection of link and eccentric to drop past such diametricallyopposite point, whereupon the operating cycle may now be initiated bymoving said hand operating lever in the opposite direction to disengagesaid brake and re-engage said flywheel.

3.- In drive means for poweroperated machines of the type in which acrank is employed 'to reciprocate a work-engaging instrument, such aspaper cutting machines, forging machines, and the like, the combinationof a crankshaft to which such crank is secured for rotation therewith, adrive shaft disposed at right angles to said crankshaft, gear meansconnecting said crankshaft and drive shaft for driving the former by thelatter, a brake on said drive shaft, a flywheel mounted for rotation onsaid drive shaft spaced from said brake, a clutch adapted to engage saidflywheel for rotation with said drive shaft, a rock shaft disposed atright angles to said drive shaft, a rocker arm on said rock shaftoperative when rocked in one direction toward said crankshaft to engagesaid brake' and disengage said clutch and when rocked in the oppositedirection to release said brake and engage said flywheel in drivingengagement with said drive shaft, a lever secured to said rock shaft, aneccentric freely rotatably mounted on said crankshaft, a link pivotallyconnecting said eccentric and :said ilever, .said link including pro--vision for lost motion in .its pivotal connection with said leverpermitting rocking .of .said lever toward crankshaft without oppositionof said link, and 'a dog on said crankshaft adapted to engage saideccentric for:rotation therewith, said link being effective, when thepivotal connection of said link and eccentric has been thus carriedaround said crankshaft to a point nearly but not quite diametricallyopposite the pivotal connection of said link and lever, automatically torock said lever to rock said rocker arm to apply said brake anddisengage said flywheel, further operation being thereby prevented untilsaid lever is manually further rocked in the same direction to applysaid brake still more firmly .and incidentally thereto permit suchpivotal connection of :link and eccentric to pass such diametricallyopposite point, whereupon the operating cycle may now be initiated atwill byrockingsaid rocker arm in the opposite direction to disengagesaid brake and vre-engage said flywheel.

4. In drive means for power operated machines of the type in which acrank is employed to reciprocate a work-engaging instrument, such aspaper cutting machines, forging machines, and the like, the combinationof a crankshaft to which such crank is secured for rotation therewith, adrive shaft, means connecting said crankshaft :and drive shaft fordriving the former by the latter, a brake for said drive shaft, a flywheel adapted to drive said drive shaft, a clutch operable "to engagesaid flywheel and drive shaft for driving thelatterand to disengage thesame, and means operative to engage said brake and operate said clutch.to disengage said flywheel and alternatively to disengage said brakeand operate said clutch to engage said flywheel comprising shiftervmeans, a lever operative to: shift said shifter means, an eccentricfreely rotatably ,1

mounted on said crankshaft, a link pivotally connecting said eccentricand lever, said link including provision for lost motion in itsconnection with said lever permitting rocking of said lever toward saidcrankshaft without opposition of said link, and a dog fixed on saidcrankshaft adapted to engage said eccentric for rotation therewith butleaving said eccentric free to rotate in advance thereof, said linkbeing of a length effective, when the pivotal connection of said linkandeccentric has been thus carried around said crankshaft to a point notquite diametrically opposite the connection of said :link and lever,automatically to rock said lever to apply :said brake and disengagesaidfiy- 7 wheel, further operation being thereby prevented until saidlever is further rocked in the same direction to permit such pivotalconnection of link and eccentric to pass such diametrically oppositepoint.

i 5. In drive means for power operated machines of the type in which acrank is employed to reciprocate a work-engaging instrument, such aspaper cutting machines, forging machines, and the like, the combinationof a crankshaft to which such crank is secured for rotation therewith,.a brake operative to stop said crankshaft, a flywheel adapted to-drivesaid crankshaft, lever means operative to engage said brake anddisengage ;said flywheel and alternatively to disengage said brake andengage said flywheel 'to drive said crankshaft, a freely rotatablymounted eccentric, a link pivotally connecting said eccentric and leverwhereby said 'lever may be rocked to engage said brake and disengagesaid adapted to engage said eccentric to -rotate the latter insynchronism with said crankshaft but leaving said eccentric freeto-rotate in advance thereof, said link being of a length effective,when the pivotal connection of said link and eccentric has been thuscarried around to a point not quite diametrically opposite theconnection of said link and lever, automatically to rock said lever toapply said brake and disengage said flywheel, whereupon a new cycle maybe initiated only after first further rocking said lever in the samedirection sufiiciently to permit such connection of link and lever topass such diametrically opposite -point.

6. In a single-cycle drive means for power operated machines having acrankshaft, a brake operative to stop such crankshaft, power meansoperative to drive such crankshaft, and means operable to apply suchbrake and disconnect such power means and alternatively to release suchbrake and connect such power means in driving relationship with suchcrankshaft; the combination of automatic control means comprising alever adapted when rocked 'in opposite directions thus to regulate suchalternative application of brake and power, an eccentric, meansconnecting said lever and eccentric adapted to rock said lever to applysaid brake and disconnect said power means as said eccentric turns, andmeans on said crankshaft adapted to engage said eccentric andautomatically operative during each revolution of such crankshaft toturn said eccentric with such crankshaft 'for a portion only of suchrevolution, said eccentric being mounted for rotation'freely in advanceof such eccentric engaging means, said connecting means being thereuponeffective to rock said lever sufficiently to apply said brake anddisconnect said power means before passing the center of rotation ofsaid eccentric, whereupon 'a new cycle may be initiated only afterfirst'further rocking said'lever in the same direction sufficiently topermit such eccentric 'to rotate further to cause said connecting meansto pass the center of rotation thereof.

'7. In single-cycle drive means for power operated machineshavingarotatable shaft, a brake operative to stop such shaft, power meansoperative to drive such shaft, and means operable to apply such brakeand disconnect such power means and alternatively to release such brakeand connect such power means in driving relationship with such shaft;the combination of automatic control'means comprising an eccentricadapted to "be driven together with said shaft but mounted for rotationrelative thereto so as to'be always free to 'turn in advanced saidshaft,and control means pivotally connected to said eccentric and adapted tobe 'reciprocated thereby to apply such brake and disconnect such powermeans shortly before the point of pivotal connectionpasses dead centerof said eccentric, whereupon a new cycle may be initiated only afterfirst moving said pivotally connected control means to permit saideccentric to continue rotation suihoiently to bring such point ofpivotal connection past dead center without corresponding furtherrotation of said crankshaft.

8. Ina power operated machine having a rotatable element and a brakeoperative to stop the same; means operative automatically to apply suchbrake comprising an eccentric, means operative to drive said eccentricwith said element but mounted to permit continued rotation of said 9eccentric relative to said element whenever said element is stopped, andcontrol means for such brakepivotally connectedto said eccentric andadaptedto be reciprocated thereby to apply such I and brake meanstherefor, a freely rotatably mounted eccentric, means on such elementadapted to engage and push said eccentric to rotate the same therewith,said eccentric being mounted for free rotation in advance of rotation ofsuch element at all times, and a link pivotally connected to saideccentric and arranged to be reciprocated thereby to apply such brakeshortly before the point of pivotal connection passes dead center ofsaid eccentric, whereupon a new cycle of operation may be initiated onlyafter moving such. point of pivotal connection beyond dead center topermit such brake to be released.

10. In mechanism including a rotatable element adapted to be rotated inone direction only and brake means therefor, a freely rotatably mountedeccentric, means on such element adapted to engage said eccentric torotate the same therewith, said eccentric being mounted for freerotation at all times in advance of rotation of such element withoutrestraint by said means on such element, and a link pivotallyconnected'to said eccentric and adapted to be reciprocated thereby toapply such brake shortly before the point of pivotal connection passesdead center of said eccentric, whereupon a new cycle of operation may beinitiated only after manually moving such point of pivotal connectionbeyond dead center to permit such brake to be released.

11. In mechanism including a rotatable element, drive means therefor,and a clutch for engaging such drive means in and disengaging such drivemeans from driving relationship with such element; means operativeautomatically to disengage such drive means comprising an eccentricmounted to be driven together with said element, means operative thus todrive said eccentric with said element without restraining saideccentric against further rotation in the same direction when saidelement is stopped, and control means for such clutch pivotallyconnected to said eccentric and adapted to be reciprocated thereby todisengage such clutch before the point of pivotal connection passes deadcenter of said eccentric, whereupon such clutch may be again engagedonly after moving such point of pivotal connection beyond dead center byfurther rotation of said eccentric while leaving said rotatable elementstationary.

12. In mechanism including a rotatable element, drive means therefor,and a clutch for engaging such drive means in and disengaging such drivemeans from driving relationship with such element; means operativeautomatically to disengage such drive means comprising a freelyrotatably mounted eccentric, means on such element adapted to engagesaid eccentric to rotate the same therewith, said eccentric beingmounted and arranged at all times for rotation in advance of rotation ofsuch element, and a, link pivotally connected to said eccentric andadapted to be reciprocated thereby to disengage such clutch shortlybefore the point of pivotal connection passes dead center of saideccentric, whereupon such clutch may be again engaged only after movingsuch point of pivotal connection beyond dead center by further rotationof said eccentric while leaving said rotatable element stationary.

13. In mechanism including an element rotatable in one direction, meansoperative to prevent rotation of such element in the other direction,drive means for such element, and a clutch for engaging such drive meansin and disengaging such drive means from driving relationship with suchelement; means operative automatically to disengage such drive meanscomprising a freely rotatably mounted eccentric, means on such elementadapted to engage said eccentric to rotate the same therewith, saideccentric being mounted and arranged for relative independent rotationin advance of rotation of such element, and a link pivotally connectedto said eccentric and adapted to be reciprocated thereby tooperate suchclutch to disengage such drive means before the point of pivotalconnection of said link and eccentric passes dead center of saideccentric, whereupon such clutch may be operated to again engage suchdriving means only after first moving such point of pivotal connectionbeyond dead center.

14. In mechanism including a crankshaft rotatable in one direction only,a flywheel. adapted to drive such crankshaft, and a clutch operative toengage such flywheel in and disengage such flywheel from drivingrelationship with such crankshaft; means operative automatically todisengage such flywheel comprising a freely rotatably mounted eccentric,means on such crankshaft adapted to engage said eccentric to rotate thesametherewith, said eccentric being at all times free for independentrotation in advance of rotation of such element, and a link pivotallyconnected to said eccentric and adapted to be reciprocated thereby tooperate such clutch to disengage such flywheel before the point ofpivotal connection of said link and eccentric passes dead center of saideccentric, whereupon such clutch may be operated to again engage suchflywheel only after such point of pivotal connection has first beenmoved beyond dead center.

15. In drive means for power driven paper cutting machines and the likehaving a crankshaft, abrake for such crankshaft, a flywheel adapted todrive such crankshaft, and a clutch operative to engage such flywheel inand disengage such flywheel from driving relationship with suchcrankshaft; means operative automatically to apply such brake anddisengage such flywheel after completion of one cycle of such machinecomprising a freely rotatably mounted eccentric, means on suchcrankshaft adapted to engage said eccentric for rotation therewith, alever operative when rocked in one direction to engage such brake andoperate such clutch to disengage such flywheel and when rocked in theopposite direction to release such brake and operate such clutch toengage such flywheel, and a link pivotally connecting said lever andeccentric having a length effective to rock said lever to apply suchbrake and I disengage such flywheel shortly before the point of pivotalconnection of said link and eccentric reaches dead center relative tosaid eccentric, whereupon a new cycle may be initiated only after firstfurther rocking said lever in the same direction sufiiciently to permitsuch connection of link and lever to pass dead center.

16. In drive means for power driven paper cutting machines and the likehaving a crankshaft, a brake for such crankshaft, a flywheel adapted todrive such crankshaft, and a clutch operative to lili engage: such"flywheel in and disengage such flywheelxfrom. driving relationship withsuch crankshaft, means operative automatically to apply such brake anddisengage. such flywheel after. completionof one cycle of such machinecomprising a; freely rotatable eccentric mounted on such crankshaft,means mountedfor'rotation with such crankshaft adapted to engage saideccentric to rotate the latter therewith, a lever operative whenrockedin: one directionto engage such brake and operate such clutch todisengage such flywheel and when ro'ckedin the opposite direction torelease such brakeand. operatesu'ch' clutch to engage such flywheel, anda linlcpivotallyconne'ctirIg' said lever andeccentric having a lengtheff ec tiveitoirock saidlever toapplysuch brake and disengage suchflywhe'el shortly before-the point: of pivotal connection of said linkand eccentric reaches dead. center" relative to said. eccentric,whereuponaa new cycle'may be-initiate'd only'after first? furtherrocking: said leverinthe same direc-- tionsufiiciently to permit thepivotal connection ofisaidllinktand.eccentric to pass dead center andthereby still further to apply such brake before said lever can then berocked in the opposite direction: to release such brakes 1 7 Inasingle-cycle drive means for: power operatedzmac'hine's having arotatableshaft, abrake operative to stop such shaft', power meansoperative to drive such: shaft, and manual lever means operable when.rocked in one direction to apply such brake: and disconnectisuch powermeans and alternatively, when rocked in the other direction, to releasesuch brake: and connect such power means in. driving relationship withsuch shaft; the combination. of; automaticcont'rol means comprising anveccentric adapted to: be: driven. together with: such. shaft but mountedfor rotation relative thereto so as to-loe alwaysfree to turnin advanceof such shaft, and operating means pivotally'cone nected tosaideccentric and adapted to he; reciprocated. thereby to rock: saidlever and apply such brake and disconnect such. power meansshortlybefore the point of. such pivotal connection passesv dead centerof said eccentric,v whereupon a: new cycle can be initiated. only after.first. manually rocking such lever. further in the same direction tomove said pivotally connected operatingmeans.

to-permit further rotation of said eccentric-inde-- pendently of suchshaft su-fficiently to bring; such pointof pivotal connection pastdeadcenter when said lever may now be rocked in the other direction toreleasesuch brake-andconnect-such power means to initiate a new cycle.

WILLIAM. c. more;

REFERENCES CITED The following references are? of record in the file ofthis. patent:

